Use LED bulbs
Swapping out incandescent bulbs for ENERGY STAR®-certified LED bulbs can keep the temperatures lower because they generate considerably less heat.
Install LED exit signs
LED exit signs can dramatically reduce maintenance by eliminating the need to replace lamps and can save about $10 per sign annually in electricity costs.
Install T8 or T5 fluorescent lighting
Replace old fluorescent and incandescent lighting with T8, or even T5, fixtures, ENERGY STAR®-certified CFLs or LEDs, and other energy-efficient lighting systems that improve light quality and reduce heat gain. CFLs cost about 75 percent less to operate, and last about 10 times longer than incandescent bulbs.
Why are CFLs different?
Most electronic controls, such as electronic timers, photo sensors, motion sensors, touch lamps and remote light controls are designed to work with the simple technology of an incandescent bulb rather than the complex circuitry of a CFL. Electronic controls draw a small amount of electricity to operate that would concurrently run a small amount of electricity through the CFL ballast, placing stress on the electronics. ENERGY STAR®-certified CFLs are made to work on dimmers.
Install light dimmers on CFL and LED bulbs
Dimmers are available for both LEDs and CFLs (ensure that you can use dimmable CFLs). Daylight dimmers are special sensors that automatically dim room lights based on the amount of free and natural daylight available.
Install timers, photo cells or motion sensors on lighting
ENERGY STAR®-certified CFLs and LEDs are now available in a variety of shapes and sizes for any application--including recessed cans, track lighting, table lamps and more. You can even find certified bulbs that are dimmable. Most electronic controls, such as electronic timers, photo sensors, motion sensors, touch lamps and remote light controls are designed to work with the simple technology of an incandescent bulb rather than the complex circuitry of a CFL. Electronic controls draw a small amount of electricity to operate that would concurrently run a small amount of electricity through the CFL ballast, placing stress on the electronics. ENERGY STAR®-certified CFLs are made to work on dimmers.
Use occupancy sensors
Consider installing automatic, occupancy sensor room-lighting controls to turn on and off lights in frequently unoccupied areas, such as bathrooms, copy rooms, supply room, warehouses, etc.
Dimmer Switches
If the light is controlled by a dimmer switch, look for an ENERGY STAR®-certified bulb that is marked "dimmable" because not all are. The package or the manufacturer's web site should provide a list for dimmer compatibility.
Install bi-level light switching
Bi-level light switching allows you to control a lighting system in groups of fixtures or lamps. For example, bi-level switching allows you to turn off half of the lights in a room when full illumination is not required.
Use LED exit signs
Swap old Open/Closed and EXIT signs with LED lighting for additional energy savings.
Install occupancy sensors
Occupancy sensors detect the motion of room occupants, turning off lights in unoccupied areas and turning them back on when movement is detected. Occupancy sensors save energy and also help to reduce maintenance costs. Turning fluorescents off for 12 hours each day can extend their expected calendar life by 75%, to nearly seven years. In large restrooms, ceiling-mounted ultrasonic occupancy sensors detect occupants around partitions and corners.
Source for the above Lighting tips: energystar.gov